1WCO. Customs Capacity Building Strategy. Brussels: World Customs Organization, 2003.
2WCO. Single Window Environment (web pages on the WCO website www.wcoomd.org). Brussels: WCO, 2008.
3WCO. Recommendation and Guidelines on establishing a Single Window No.33 [EB/OL].United Nations Economic Commission for Europe-official homePage,2010.
4World Economic Forum. The Global Competitiveness report 2010-2011. Palgrave Macmillan, 2010.
5UNNExT:Towards a Single Window Trading Environ-ment. http://www.unescap.org/unnext/pub/brief6.pdf . 2011
6Jonathan Koh Tat Tsen.Ten years of Single Window Implementation:Lessons learned for the future[Z].Global Trade Facilitation Conference 2011 Connecting International Trade:Single Windows and Supply Chains in the Next Decade.